HW10-Help - Kogge-Stone(8-Bit Kogge-Stone(8-Bit...

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square5 Consider it for a 1-bit adder and verify square5 Propagate = Does an incoming carry propagate to the next stage? square5 Generate = Do the given inputs create a carry in this stage ?
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square5 Generalizing the concept of single PG square5 Unit cells of your design: square5 Basic idea: A carry output from a block of bits i-j is either generated in a subset of that block i-k or has propagated from the remaining block k-j:
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square5 PG Logic -> Straightforward implementation square5 Output Sum Logic -> Think in terms of PG logic : square5 PG Tree (Black Cell, Grey Cell)
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square5 Pay attention : PG Generation not shown! square5 Sum logic not shown!
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square5 How would you implement As a circuit? -> This would be the Black-Cell, when you don’t need the block propagate this becomes the Grey-Cell
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square5 First add the lower half --- square5 Then add the higher half with the previous sum square5 Carry must be carried along square5 To ensure timing and synchronization use
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Unformatted text preview: Kogge-Stone (8-Bit) Kogge-Stone (8-Bit) Kogge-Stone (8-Bit) Kogge-Stone (8-Bit) FF Bank FF Bank FF Bank FF Bank FF Bank FF Bank Bits: A8-A15 B8-B15 Bits: A7-A0 B7-B0 + Carry In Intermediate Carry Outputs 8-15 Outputs 7-0 Carry out s .vec file available (SIGNAL NAMES MUST MATCH) b I used A15, A14,… B15, B14,. .B0 s .cfg file available s simulation setup files available s You only need your own NETLIST from Analog Environment s Command is: nanosim -nspice netlistfinal -nvec ks16.vec -c ks16.cfg -out fsdb -z tt -t 100 s View Higher order and Lower order bits differently s Always include CLOCK s Add input and output Flip-Flops if you like s ABCD + 0510 = B0DD Below; higher order bits are shown, We must see “B0” Testing your design s ABCD + 0510 = B0DD Now, check the lower order bits, We must see “DD” (from 7-0)...
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